I bought a 2021 YZ450F a couple years ago from a guy in Cleveland. ALL the typical signs of a stolen bike... but it turned out to be legit.
Clean title notarized and all.
He even took the bike for one last ride and showed me some insane wheelies in the middle of the street. I was impressed.
Now, I did do my due diligence and vetted out the situation before just driving into Cleveland blind. In addition to a large amount of social media stalking, I was actually able to get in contact with the previous owner and he told me his deal with him went seamless.
Not saying this one, or others, aren't stolen BUT there are some deals out there that are legit. This guy even expressed his frustration with how these people that steal bikes are giving them a bad rap.
I've bought/sold a lot of bikes and I've learned to always treat each buyer/seller the same. Do your homework on everyone, every single time. Cross your t's and dot your i's before meeting anyone anywhere.